Exploring One-by-Two-Digit Multiplication with Sketching Arrays

The video tutorial teaches third graders how to use arrays to solve one-digit by two-digit multiplication problems. It begins with an introduction to the concept of arrays and their application in multiplication. The teacher then guides students through two example problems: calculating the total number of students on a field trip and determining the number of drinks bought for a party. Students are encouraged to use base ten grids and reflect on different strategies to find the most efficient solution. The lesson concludes with a self-assessment of their comfort level in using arrays.

What materials do you need to start solving the multiplication problems?

• A notebook and a pen

• A scratch piece of paper and a pencil

• A calculator and a ruler

• A computer and a mouse

In the first problem, what does the number 4 represent?

• The number of classes on the field trip

• The number of teachers on the trip

• The number of museums visited

• The number of students in each class

What does the number 27 represent in the first problem?

• The number of buses used

• The number of teachers in each class

• The number of students in each class

• The number of museums visited

Which of the following is a possible strategy to solve 4 times 27?

• 4 times 30 minus 12

• 4 times 20 plus 4 times 7

• 4 times 25 plus 4 times 3

• 4 times 10 plus 4 times 17

What is the total number of third graders who went to the museum?

• 104

• 116

• 112

• 108

In the second problem, what does the number 6 represent?

• The number of tables at the party

• The number of guests at the party

• The number of drinks in each six-pack

• The number of six-packs bought

What does the number 22 represent in the second problem?

• The number of tables at the party

• The number of six-packs bought

• The number of drinks in each six-pack

• The number of guests at the party

Which of the following is a possible strategy to solve 6 times 22?

• 6 times 20 plus 6 times 2

• 6 times 25 minus 6 times 3

• 6 times 10 plus 6 times 12

• 6 times 15 plus 6 times 7

What is the total number of drinks bought for the party?

• 128

• 130

• 134

• 132

On a scale of 1 to 5, how comfortable are you using arrays to solve larger story problems?

• 5 - Very confident

• 4 - Comfortable

• 3 - Somewhat comfortable

• 1 - Not comfortable at all